A DIN rail is a standardized 35 mm wide metal rail with hat-shaped cross section. It is widely used, especially in Europe, for mounting circuit breakers and industrial control equipment inside equipment racks. A modem (a portmanteau word constructed from modulator and demodulator) is a device that modulates an analog carrier signal (sound), to encode digital information, and that also demodulates such a carrier signal to decode the transmitted information. ... A circuit breaker is a piece of equipment which is designed to protect an electrical apparatus from damage caused by overload or short circuit. ...
References
European Standard EN 50022: Specification for low voltage switchgear and controlgear for industrial use. Mounting rails. Top hat rails 35 mm wide for snap-on mounting of equipment.
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